Pacific Research Solutions RI-300e User Manual
Page 77
S-Cmd 50 ADJUST SQUELCH
The Adjust Squelch command sets the squelch level of the digital potentiometer in the RI-300. This digital potentiometer has
64 positions, (00 through 63). You can adjust the squelch level in single steps by sending a “50*” to incr e ment the leve l up one
step, or a “50#” to decrement the level setting down one step. See section 7 for additional information on setting the squelch
level.
SYNTAX: 50 [Level]
READ BACK 50
STORAGE: RAM/EEPROM
PARAMETERS: Level 0-63 = Numeric pot positions (0 = Minimum value and 63 = Maximum value)
Level * = Raise pot by one step only
Level # = Lower pot by one step only
DEFAULT: 31
EXAMPLE: 50 * Adjusts squelch level setting up by one step.
50 23 Sets squelch digital pot to position 23.
S-Cmd 51 SET SQUELCH MODE
Use this command to select between external squelch, standard squelch mode and SmartSquelch. In the SmartSquelch mode,
the controller uses the processor to analyze the signal to noise ratio, and determine whether to close the squelch fast or add
delay for nosey signals. This feature will help to reduce the squelch gate from chopping the audio during mobile flutter or a
hand held radio moving in and out of nulls. This algorithm will react as fast as 10 ms when the input signal is full quieting and
a proportionally longer time to close squelch when the input signal becomes noisier. In the external squelch mode, digital input
#1 is used as the squelch input (COS). This signal is active low.
SYNTAX: 51 [Mode]
READ BACK 51
STORAGE: RAM/EEPROM
PARAMETERS: Mode 0 = External Squelch: You can connect an external squelch circuit to digital input 1 and use this
mode to tell the controller to use the external squelch.
Mode 1 = SmartSquelch: T his is an internal squelch circuit that uses Digital Signal Processing (DSP) to
perform enhanced squelch functions.
Mode 2 = Normal Squelch: This is an internal squelch circuit that o perates like the squelch on a standard
radio.
DEFAULT: 1, SmartSquelch
EXAMPLE: 51 2 Selects normal squelch mode